Dynamically Loaded Journal Bearings: Finite Element Method Analysis

Goenka, P. K.

doi:10.1115/1.3260954

Cited by 125 publications

(45 citation statements)

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“…The journal displacement at next time step was determined by using Runga-Kutta method. The results obtained match well with those using FEM (Goenka, 1984) at much less computation cost.…”

Section: Introductionsupporting

confidence: 80%

Dynamic Analysis of Engine Bearings

Hirani

Athre

Biswas

1998

International Journal of Rotating Machinery

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This paper presents a simple methodology to evaluate the stiffness and damping coefficients of an engine bearing over a load cycle. A rapid technique is used to determine the shaft 'limit cycle' under engine dynamic loads. The proposed theoretical model is based on short and long bearing approximations. The results obtained by present approximation are compared with those obtained by numerical method. The influence of thermal effects on the stiffness and damping coefficients is predicted by using a simplified thermal analysis. In order to illustrate the application of the proposed scheme, one engine main bearing and a connecting rod bearing are analysed.

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“…The journal displacement at next time step was determined by using Runga-Kutta method. The results obtained match well with those using FEM (Goenka, 1984) at much less computation cost.…”

Section: Introductionsupporting

confidence: 80%

Dynamic Analysis of Engine Bearings

Hirani

Athre

Biswas

1998

International Journal of Rotating Machinery

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“…In a broad sense, dynamically loaded spherical joints can be classified into two main groups, namely the squeeze-film action and the wedge-film action [43][44][45][46][47][48][49][50]. The first group refers to the situations in which the ball does not rotate significantly about its center, rather the ball moves along some path inside the socket boundaries.…”

Section: Dynamics Of Spherical Jointsmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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The dynamic modeling and simulation of spatial rigid-multi-body systems with lubricated spherical joints is the main purpose of the present work. This issue is of paramount importance in the analysis and design of realistic multibody mechanical systems undergoing spatial motion.When the spherical clearance joint is modeled as dry contact; i.e., when there is no lubricant between the mechanical elements which constitute the joint, a body-to-body (typically metal-tometal) contact takes place. The joint reaction forces in this case are evaluated through a Hertzian-based contact law. A hysteretic damping factor is included in the dry contact force model to account for the energy dissipation during the contact process. The presence of a fluid lubricant avoids the direct metal-to-metal contact. In this situation, the squeeze film action, due to the relative approaching motion between the mechanical joint elements, is considered utilizing the lubrication theory associated with the spherical bearings. In both cases, the intrajoint reaction forces are evaluated as functions of the geometrical, kinematical and physical characteristics of the spherical joint. These forces are then incorporated into a standard formulation of the system's governing equations of motion as generalized external forces. A spatial four bar mechanism that includes a spherical clearance joint is considered here as example. The computational simulations are carried out with and without the fluid lubricant, and the results are compared with those obtained when the system is modeled with perfect joints only. From the general results it is observed that the system's performance with lubricant effect presents fewer peaks in the kinematic and dynamic outputs, when compared with those from the dry contact joint model.

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“…The onset of the self-excited motion occurs slightly earlier in the authors' results than in the article by Schweizer. The difference can be accounted to of a cavitation model [29] in [5], which is not used in the HOTINT model. The difference in onset rotational speeds is also small.…”

Section: Customized Laval/jeffcott-rotor In Plain Hydrodynamic Bearingsmentioning

confidence: 99%

The Effect of Non-Circular Bearing Shapes in Hydrodynamic Journal Bearings on the Vibration Behavior of Turbocharger Structures

Bernhauser¹,

Heinisch²,

Schörgenhumer

et al. 2017

Lubricants

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Increasing quality demands of combustion engines require, amongst others, improvements of the engine's acoustics and all (sub)components mounted to the latter. A significant impact to the audible tonal noise spectrum results from the vibratory motions of fast-rotating turbocharger rotor systems in multiple hydrodynamic bearings such as floating bearing rings. Particularly, the study of self-excited non-linear vibrations of the rotor-bearing systems is crucial for the understanding, prevention or reduction of the noise and, consequently, for a sustainable engine acoustics development. This work presents an efficient modeling approach for the investigation, optimization, and design improvement of complex turbocharger rotors in hydrodynamic journal bearings, including floating bearing rings with circular and non-circular bearing geometries. The capability of tonal non-synchronous vibration prevention using non-circular bearing shapes is demonstrated with dynamic run-up simulations of the presented model. These findings and the performance of our model are compared and validated with results of a classical Laval/Jeffcott rotor-bearing model and a specific turbocharger model found in the literature. It is shown that the presented simulation method yields fast and accurate results and furthermore, that non-circular bearing shapes are an effective measure to reduce or even prevent self-excited tonal noise.

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Dynamically Loaded Journal Bearings: Finite Element Method Analysis

Cited by 125 publications

References 0 publications

Dynamic Analysis of Engine Bearings

Dynamic Analysis of Engine Bearings

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

The Effect of Non-Circular Bearing Shapes in Hydrodynamic Journal Bearings on the Vibration Behavior of Turbocharger Structures

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